Questions and answers

Both start with an isocyanate. Polyurea reacts it with amine resins and cures very fast. Polyurethane reacts it with polyols and usually cures more slowly. See the chemistry page.

It depends on the specific products. Both families include soft and hard grades. Compare tensile strength, elongation and hardness on the data sheets for the job you have in mind.

Spray grade polyurea usually gels within seconds and can take light traffic soon after. Most polyurethane coatings take hours or longer. Temperature and humidity change both.

Aromatic grades of both tend to darken or chalk outdoors. Aliphatic grades hold color better and are often used as topcoats.

Many polyurethane coatings can be rolled on by careful owners. Spray polyurea needs heated plural component rigs, training and protective gear, so it is usually applied by trained crews.

A blend that mixes amine and polyol resins on the same side, so it behaves somewhere between the two. See the hybrid guide.

Fully cured films are generally inert, but the liquid components, especially isocyanates, need careful handling. Follow the safety data sheet and any local rules for the specific use.

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